John salisbury



(No Model.)

J. SALISBURY. DUST PROOF CHAIN GUARD.

No. 582,099. Patented May 4, 1897.

NlTED JOHN SALISBURY, OF ARLINGTON, NIUV JERSEY, ASSIGNOR TO THE ARLING-TON MANUFACTURING COMPANY, OF SAME PLACE.

DUST-PROOF CHAIN GUARDQ SPECIFICATION forming part of Letters Patent No.582,099, dated May 4, 1897.

Application filed August 5, 1896.

To all whom it may concern.-

Be it known that I, JOHN SALISBURY, a citizen of the United States,residing at Arlington, in the county of Hudson and State of New Jersey,have invented new and useful Improvements in Dust-Proof- Chain-Guards,of which the following is a specification.

This invention relates to gear-cases for cycles, and has for its objectto provide a de- IO tachable practically dust-proof gear-case andchain-guard constructed from transparent material to permit inspectionof the condition and working of the chain and capable of adjustment tosuit the distance between the 1 5 sprocket-Wheels with which thedriving-chain connects.

The invention consists in certain features of construction in agear-case and chain-guard for bicycles, as hereinafter described and asclaimed.

In the annexed drawings, illustrating the invention, Figure l is anouter side elevation of my improved gear-case and chain guard.

Fig. 2 is a vertical section of the same on the line 2 2 of Fig. 1. Fig.3 is a similar section of the same on the line 3 3 of Fig. 1. Fig. 4c isan inner side elevation of the case or guard.

In order to furnish a gear-case and chainguard that shall be light,durable, and transparent, it is preferable to construct it from amaterial such as pyralin or a like pyroxylin compound. This material canbe readily molded into required shapes and is transparent, tough, andlight.

For the purpose of making the gear-case adjustable to increase ordiminish its length it may be constructed in telescopic sections to slipreadily one into another.

The gear-case, as shown, is made in three 0 sectionsnamely, a central ormain section that comprises an upper tube 5 and a lower tube 6 toinclose the corresponding parts of the driving-chain, a curved endsection 7 to inclose the sprocket-gear on the cranked driv- 5 ing-shaft,and a smaller curved end section 8 to inclose the sprocket-gear on theaxle of the rear wheel of a bicycle or velocipede.

At or near their ends the tubular parts 5 and 6 are connected byvertical braces 9, preferably composed of pyralin in the form of blocks.The upper and lower tubes 5 and 6 Serial N0- l,'751. (N0 model.)

are slotted to receive the ends of the braces 9, which will thereby moresecurely stiffen the adjustable gear-case or chain-guard.

The ends of the chain-inclosing tubes 5 and 6 are fitted into the curvedend sections 7 and 8, that are to inclose the sprocket-gears, and as ameans for securely conn ectin g these tubes and end sections there maybe provided metal bands 10, arranged to closely embrace the end sectionsat the points of junction with the tubes. These metal bands 10 may bebolted or riveted in any convenient manner to the braces 9 and also tothe tubes 5 and 6 and the curved end sections. The bands 10, or clampingattachments 11 and 12 thereon, may serve as means for detachablysecuring the gearcase and chain-guard to the usual horizontal rod, tube,or stay at the lower part of a bicycle-frame. The longitudinal space 13between the tubes 5 and 6 permits a proper arrangement of the gear-casewith relation to the said stay portion of the bicycle-frame. The curvedend section 7 of the gear-case is provided with suitable openings 14 and15 for passage of the pedal-crank shaft, and suitable openings 16 and 17are provided in the end section 8 for passage of the axle or hub of thedriving-wheel.

In order that the gear-case may be readily adjustable to vary its lengthaccording to the distance from one sprocket-gear to the other, the tubes5 and 6 are each divided transversely or formed in two sections thatwill telescope one within the other, as shown. It will be seen that thisgear-case may be readily detached when desired and may be easily andconveniently adjusted to the length of driving-chain required.

The case or guard is practically dust-proof and will protect thedriving-chain and gears from mud and dirt, and consequently lessen theneed for cleaning and lubrication. Being constructed of transparentmaterial the case or guard will permit inspection of the condi tion andworking of the chain at all times, so that the guard need not be removedfor that purpose. In a ladys Wheel the guard serves to prevent theskirts from catching in the chain. It is light and not heavy orcumbersome, as one made from leather, wood, metal, or similar material,and it is susceptible of ornamentation and may be produced in colorswith either opaque or transparent effects, as usual with articles madefrom pyralin or like pyroxylin compounds.

To make each of the tubes 5 and 6 telescopic, they may be divided at anypreferred point either centrally or toward either end of the gear-case,and the respective sections may be made to slide one into another anydesired distance to afford the required range of adjustment. Ifpreferred, the adjustment of the gear-case may be effected by atelescopic connection at the junction of the tubes 5 and 6 with thecurved end 7 of the gear-case.

What I claim as my invention is The herein-described cycle gear-case andchain-guard composed of the upper and lower tubular members 5 and (3,the Vertical bracing- JOHN SALISBURY.

\Vitnesses:

EMMET SCHULTZ, P. E. BRooKWAY.

